Spirit level



M. A. DAVl SPIRIT LEVEL Feb. 13, 1951 Filed April 15, 1950 I. Gm

f w m VENTOR ATTORNEY Patented Feb. 13, 1951 UNITED TiSTAiTfES iPATENTSOFFICE 1 Claim.

This invention relates to tools and more particularly spirit levels.

One of the objects of this invention resides in the provision of aspirit level adapted to indicate all angles of a circle.

Another object of this invention resides in the particular constructionof the opposed sections of the spirit level casing.

Another object of this invention resides in the particular constructionof the liquid tube of the spirit level unit.

A further object of this invention resides in the combination of theliquid tube and casing.

With these and other objects in view, this invention resides in certainnovel features of construction and arrangement of elements to behereinafter more particularly set forth in the specification,illustrated in the accompanying drawing and pointed out in the appendedclaim and, although this disclosure depicts my present conception of theinvention, the right is reserved to resort to such departures therefromas come within the spirit of the invention.

In the accompanying drawing forming a part of this application;

Fig. 1 is a side view of the spirit level.

Fig. 2 is a horizontal sectional view taken approximately on line 22 ofFig. 1.

Fig. 3 is a vertical sectional view taken approximately on line 33 ofFig. 1.

Fig. 4 is an inner end view of one section of the casing with the liquidtube disposed therein.

Fig. 5 is a similar view of the other section of the casing.

Fig. 6 is a perspective view of the liquid tube.

In the present illustration of this invention the numeral 5 designates,in general, a mechanics spirit level which consists of a base 6 formedof suitable material and provided with an enlarged opening 1 having anannular rib 8 formed on its periphery inwardly of the opposite sides ofthe base.

Secured within the aforesaid opening 1 is a substantially disc shapedspirit level unit 9 formed of transparent plastic or other suitablematerial into companion sections ID and II having flanges l2 and i3retained against opposite sides of said rib by a screw l4 preferablyconnecting the sections together at their centers.

Although the spirit level unit is herein shown as being set inwardly ofthe sides of the base, it may be disposed therein with its oppositesides coinciding with those of the base.

Formed in the inner surfaces of the aforesaid sections adjacent theirperipheries l5 and iii are ends of liquid within the tube relative tozero marks Z scribed onopposite sides of the base outwardly of theaforesaid enlarged opening therein.

Formed on the inner surface of the companion sections inwardly of theannular grooves therein are circumferentially arranged graduations 22and 23 with which other graduations 24 and 25 formed in the grooves l7and I 8 radially align. The circle occupied by the graduations 22 isfurther divided by major graduations 25.

Circumferentially arranged on opposite sides of the aforesaid zero marksoutwardly of the enlarged opening therein and spirit level unit areother degree marks 21 which, while herein shown as disposed at fortyfive and ninety degrees about a circle, may be otherwise disposed.

With the liquid tube disposed between the transparent sections andhaving opposite ends of the liquid therein disposed in alignment withthe zero marks on the base while resting on a horizontal plane,longitudinal tilting of the base will move the graduated sections aroundthe liquid to obtain or determine various angles of work operated on andthrough the provision of the transparent elements forming the spiritlevel unit, the graduations are easily read therethrough from eitherside of the same.

With this invention fully described, it is :manifest that a spirit levelis provided whereby accurate calculation of angles can be determined andthrough the particular construction and arrangement of the spirit levelunit, assemblage and adjustment of the same in the base can beaccomplished by unskilled labor with use of a single tool.

Having thus described my invention, what I claim and desire to protectby Letters Patent is:

A spirit level of the character set forth, the combination of a basehaving an enlarged hole therein, an annular rib formed on the wall ofsaid hole, companion transparent discs having opposed annular groovesformed in their inner surfaces adjacent their peripheries, said groovesbeing of substantially semi-circular configuration 3 in cross sectionand communicating with opposed recesses extending radially therefrom,annular flanges formed on the peripheries of said discs and bearingagainst opposite sides of the aforesaid annular rib, a transparent ringshaped liquid tube seated in the opposed grooves, a radially extendinglug formed on the outer periphery of the ring shaped tube and seated inthe aforesaid recesses, a screw securing the disc shaped sectionstogether and flanges thereof against the annular rib in the hole of thebase, graduations formed on the inner surfaces of the disc shapedsections adjacent the aforesaid grooves therein and aligning with othergraduations in the grooves, and graduations disposed on oppositesurfaces of the base adjacent the hole therein. MARION A. DAVIS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

